class Point3D(object):
    def __init__(self,x,y,z):
        self.x=x
        self.y=y
        self.z=z
    
    def __repr__(self):
        return "(%d, %d, %d)"%(self.x,self.y,self.z)
    
my_point=Point3D(1,2,3)

print my_point